53 lines
1.1 KiB
TypeScript
53 lines
1.1 KiB
TypeScript
export function extendRangeToWordBoundaries(range: Range): void {
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const { nodeValue: startValue } = range.startContainer
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const { nodeValue: endValue } = range.endContainer
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const startOffset = findNextWord(range.startOffset, false, startValue)
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const endOffset = findNextWord(range.endOffset, true, endValue)
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try {
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range.setStart(range.startContainer, startOffset)
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range.setEnd(range.endContainer, endOffset)
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} catch {
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console.warn('Unable to snap selection to the next word')
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}
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}
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const isWhitespace = (c?: string): boolean => !!c && /\s/.test(c)
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function findNextWord(
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start: number,
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forward: boolean,
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str?: string | null
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): number {
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if (!str) {
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return start
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}
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const chars = str.split('')
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let i = start
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if (forward) {
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if (isWhitespace(chars[i - 1])) {
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return i - 1
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}
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while (i < str.length) {
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if (isWhitespace(chars[i])) {
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return i
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}
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i++
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}
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} else {
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if (isWhitespace(chars[i])) {
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return i + 1
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}
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while (i > 0) {
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if (isWhitespace(chars[i - 1])) {
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return i
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}
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i--
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}
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}
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return i
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}
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